ACTIVE JumpForward - JumpForward serves over 150,000 users and 175 college athletic departments with recruiting and camp management software built to keep you compliant.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform

SurfersList - The ultimate online solution for finding, buying, and selling new and used surf equipment.

pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features